DOCS-14831 shift dateAdd dateSubtract release note

Author: mungitoperrito

source/release-notes/5.1.txt

@@ -15,12 +15,6 @@ General
 
 .. include:: /includes/in-dev.rst
 
-Issues fixed:
-
-- `SERVER-59765 <https://jira.mongodb.org/browse/SERVER-59765>`__
-  Detect an overflow for certain 'amount' values in
-  :expression:`$dateSubtract` and :expression:`$dateAdd`.
-
 Aggregation
 -----------
 
@@ -49,6 +43,17 @@ MongoDB 5.1 introduces the following aggregation operators:
    * - :expression:`$tsIncrement`
      - .. include:: /includes/tsIncrement-introduction.rst
 
+
+General Aggregation Improvements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+:expression:`$dateSubtract` and :expression:`$dateAdd`: Improved Input Validation
+`````````````````````````````````````````````````````````````````````````````````
+
+Starting in MongoDB 5.1, :expression:`$dateSubtract` and
+:expression:`$dateAdd` report an error when an overflow is detected for
+``amount`` values.
+
 .. _5.1-rel-notes-change-streams:
 
 Change Streams